Projection slide mounting



Oct. 17, 1939. c. L. wHlTEFoRD PROJECTION SLIDE MOUNTING Filed June 3 0, 1957 INVENTOR ,Patented oei. 17, 1939 UNITE-D STATES PATENT oFFicE v raomorlol'llsxrg; MoUN'rrNG Apllgttnuzlggilio5137 7 Claims.

lThis invention relates to improvements in slides for projecting purposes and relates more particularly to the provision of a simple slide assembly and mounting means lfor mounting a pho- 5 tographic film for projection.

With the present developments of colored photography the practice has grown of mounting photographic iilms upon slides and displaying the same by projection. Projection slides for this purpose now in common use adopt the well known features of passe partout picture mounting. Such slides are commonly now made by taking a pairof glass plates, placing the film between mats or frames which are disposed upon each side of the film and then placing the mats between the glass plates and securing the glass plates together. The mats frame the picture upon projection and center it with respect to the outside of the glass. Care must be taken, of course, to properly center the film with respect to the mats. After such slide components are is that lthe film` is not disposed in intermediate juxtapositionto the glass plates, but it is spaced from each plate by the thickness of the mat.

This permits slight buckling of the film, which is objectionable during projection because the desired sharp focus cannot be maintained.

The present invention has for its objects, the provision of improved mounting means whereby the above difficulties may be largely, if not wholly, obviated.

A further object oi' the present invention resides in the provision of an improved film and sides inthe provision of an improved mounting means for slides wherein the film may be placed in direct contact with each 8185s Plat@ .limi

(Cl. y88-28) maintained at and prevented from buckling, thereby improving projection.

A further object of the present invention re` sides in the provision of slide mountings which will provide for the securing of glass plates and 5 lm in assembled relation, by mechanical means which will obviate the necessity of the use of gummed tape border material or the like.

A further object of the present invention re- .sides in the provision of a slide mounting which l is cheap, relatively inexpensive to manufacture and easy to assemble, even by the most inexperienced person.

A further object of the present invention resides in the provision of a slide mounting means l of the character described having means provided thereon for the reception of indicia adapted to designate the front with respect to the back of the slide and the top with respect to the bottom. of the slide and the number of the slide in order that projection may be facilitated.

Further and other objects of the present invention will be hereinafter set forth in the accompanying specification and claims and shown in the drawing which shows by way of illustration 2li a preferred embodiment and the principle thereoi' and what I now consider to be the best mode in which I have contemplated of applying that principle. Other embodiments of the invention employing the same or equivalent principle may be used and structural changes made as desired by those skilledin the art without departing from the present invention and within the spirit of the appended claims.l

In the drawing:

Figure 1 is a top plan view of the complete slide mounting with the parts in assembled relation therein; the glass is shown broken away to show the illm.

Fig. 2 is a partial sectional view, the section 40 being taken on line 2-2 of Fig. 1 and looking in the direction oi' the arrows;

Fig. 3 is another detailed sectional view, the section being taken substantially on line 3--3 of Fig. '1;

Fig. 4 is a' perspective view of the completed slide; and l Fig. 5 shows a modification with tabs to secure the cups together.

In more detail in the drawing, the slide-mount- 50 ing preferably comprises a pair of cup-shaped members I0 and Il. Member i0 is provided with an annular edge portion Illa and member Il is provided with an annular edge portion Ila. These edge portions Ilia and Ila are adapted to 55 telescope together as shown in Figs. 2 and 3. The

Il. The members Il and II may also be prof vided at the corners of the ange portions with one or more cup1ike depressions I5. Such cuplike' depressionsv may be used to receive a slide identifying marking, one of which is shown at lia in Fig. 4. 'Ihe applied marking I5a serves to not only indicate the number of the slide, but

it also serves to locate the top right hand corner of the slide to facilitate placing the slide in proper position in the projecting machine.

Referring now to Figs. 2 and 3, I6 and I'Irepresent a pair of glass plates and I8 represents the film which is disposed. between the plates. In making up a slide, the general practice would be to place the lower glass plate I6 into the inner cup member I0, the cup member at' its rounded corners will substantially centralize the glass plate therein. As shown in Fig. 1, the glass plate at its corner abuts the rounded inner corner of the cup Il, thereafter the lm I8 will be placed upon the lower plate IB.

In practice it may be convenient to have a source of light under the slide to facilitate in- 'spection of the film, so that the iilm I8 can be centralized properly with respect to the framing marginal edge I4 of the lower cup. If desired, after the film is centralized it may be secured in position with respect to the lower glass plate by adhesive' cement applied at the edges of the lm or through the customary sprocket apertures if such are in the film.

The glass plate I1 is now placed in position over the topv of the iilm. This plate is likewise substantially centralized in the lower cup. The iinal operation is to place the top member II in position, the same telescoping at its annular edges IIa over the annular edges Ia of the lower cup. Friction between the annular edges Ilia. and Ila serves to hold the parts in assembled relation.

' With the parts in such assembled relation it will be observed that the parts I4 come into surface contact with the glass plates and .tend to clamp the plates together and keep them vin tight contact with the nlm. One or more of the depressed portions I! also may contact with the glass plates and aid in clamping them together. These depressed portions IS also serve to provide a reinforcement and stiifening for the corners of the cup members. y

In use-the edge portions Il afford a framing for the picture upon projection. It will be'noted that while the framing edge I 4 is not in sharp focus because the plane of focus is at the plane of the nlm I8, the edge portions Il will aiford a denite framing line free from any irregularities which wouldv result in fuzzy marginal edges upon projection. 'I'he projected picture willI have a pleasing appearance with a slightly shadowy frame line. Such frame line will not however have the fuzzy eHect which is producedv with paper mats which are now in use.

' The slide mounting described has other lncidental advantages when in use. The exterior diposition in the projecting machine as every other slide and which will obviate the necessity of refocusing the Projecting machine from slide to slide.

The-iinished slide has slightly rounded corners which is desirable from a point of ease of handling. f

The slide mounting described provides a me-y chanical means. for holding the glass plate in assembled position with a. lm therebetween and obviously obviates the use of material such as gum tape for binding the marginal edges. The matter of assembling of the slides is considerably' expedited over practices now in use and slides can be neatly mounted by the most inexperienced person in a minimum of time. 'I'he lm is maintained in direct contact with the glass on each side of vthe film and buckling prevented. Further no paper mats are required and the diiliculties of cleaning the'edges of such mats and removing paper fragments is obviated.

If desired one of the cup members, for example the inner one may be provided .with one or more tabs extending up from the top edge to I a and projecting through slots in the top telescoping cup. Such tabs would then be bent over preferably into arecess provided in the top cup. 'I'his construction would provide a means of positively locking the cups together. In Fig. 5, I 0b indicates the tabs which project through slots IIb in part II and which fold down into recesses or depressions IIc in the top of II.

What I claim 'isz 1 A slide mountingl structure comprising an assemblable pair of cup-shaped members and a pair of glass plates, which plates receive and align a fllm therebetween, said cup-shaped members comprising telescoping edge portions and cutawayportions aii'ording picture openings, said members when assembled enclosing and holding said plates wherebythe film is maintained in aligned position for projection through the picture openings of the members, at least one of the cup-shaped members having depressions between its inner and outer edge for receiving identifying means for the picture, the depressed portions of the last mentioned cup-shaped member providing face-engaging abutments for engaging the adjacent face of the adjacent glass plate.

2. A slide mounting structure comprising an assemblable pair `ofcup-shaped members and a pair of glass plates, which plates receive and align a iilm therebetween, said cup-shaped members having telescoping edge portions'and cutaway portions afording picture openings, said members when assembled enclosing and holding said plates whereby the lm is maintained in aligned position for projection through the picture openings of the member, both of said cupshaped members having ilange portions adjacent V the picture openings turned inwardly towardA the glass plates to clamp the plates and afford a clean cut framing edge.

3. A slide mounting structure comprising an assemblable pair of cup-shaped members and a .pair of glass plates, which plates receive and align a film therebetween, said cup-,shaped members having telescoping edge portions and cutawayl portions aifording picture openings, said members when assembled enclosing and holding said plates whereby the lm is maintained in aligned position for projection through the picture openings of the members, at least one of said members having its inner edge flanged and turned inward toward the adjacent glass plate to abut envases the glass plate with a line contact and afford a 'clean eut framing edge for the picture upon projection.

4. A slide mountingstructure comprising an assemblable pair of cup-shaped members and a pair of glass plates, which' plates receive and align a film therebetween, said cup-,shaped members having telescoping edge portions and cutaway portions affording picture openings, ysaid members when assembled enclosing and holding said plates whereby the illm is maintained in aligned position for projection through the picture openings of the members, both of said members between the outer edges and picture openings having a plurality of depressed areas to abut the surface of the glass plates for the purpose described. o

5. A slide mounting structure comprising an assemblable pair of' cup-shaped members and a pair of glass plates,l which plates receive and align a ilm therebetween, said cup-shaped members having teiescoping edge portions and cutaway.v portions affording picture openings, said members .when assembled enclosing and holding said plates'whereby the lm is maintained in aligned position for projection through the picture openings of the members, one of said mem- 'bers having deformable portions to engagein depressed portions of the other 'cup-shaped member to positively hold the inner cup in assembled relation with respect to the outer cup and to maintain clamping pressure on the glass plates when the parts are assembled.

6. A slide mounting structure comprising a pair of cup-shaped membersV having telescopic edge portions and aligned central picture framing openings, a pair of glass plates enclosed by said cup-shaped members for holding, supporting and aligning a film therebetween, said cup-shaped members having depressed areas on the side portions thereof positioned between the rim portions and the central picture opening to receive identifying means or the like and affording face-engaging abutments with the glass faces whereby the lm` is positioned before the picture opening for projection upon a screen.

7. A slide mounting structure comprising a. pair of glass plates for receiving a film therebetween, a pair of cup-shaped members having flange and telescoping edge portions for enclosing and housing the outer edges and faces of the glass plates and for securing the assemblage together with the lm between the plates, said members each having centrally apertured portions affording a picture projecting opening, the inner of said cup-shaped members having portions for marginally engaging both glass plates and for preventing substantial shift of both glass plates in all -c directions and preventing film disalignment, both of said members having portions depressed inward from the outer surfaces into contact with the faces of the glass plates for applying localized clamping pressure thereto. f

' CARLTON L. WH'LEFORD.

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